画布放大部分

我想部分放大帆布板，因为信纸托盘按钮将被固定，并且主板将变焦，
部分编码如下所述，屏幕完全画在帆布上，可以被视为底部提及..请帮助，并感谢您的关注。画布放大部分

 public class BoardView extends SurfaceView implements SurfaceHolder.Callback 
       { 
     class DrawingThread extends Thread implements OnTouchListener { 

     public DrawingThread(SurfaceHolder holder, Handler handler) { 
        mSurfaceHolder = holder; 

     public void setRunning(boolean b) { 
        mRun = b; 
       } 

       @Override 
       public void run() { 
        while (mRun) { 
         Canvas c = null; 
         try { 
          c = mSurfaceHolder.lockCanvas(null); 

     synchronized (mSurfaceHolder) { 
           // System.gc(); 
           // c.scale(canvasScaleX, canvasScaleY); 
           // c.save(); 
           // c.translate(canvasTranslateX, canvasTranslateY); 
           doDraw(c); 
          } 

          updateGame(); 
         } finally { 
          if (c != null) { 
           mSurfaceHolder.unlockCanvasAndPost(c); 
          } 
         } 
     } 

     private void doDraw(Canvas canvas) { 
        if (ge == null) 
         return; 

         Rect bRect = new Rect(0, 0, dims.getTotalWidth(), 
         dims.getScoreHeight() + dims.getBoardheight()); 
       Drawable drawable = getResources().getDrawable(R.drawable.board); 
       drawable.setBounds(bRect); 

       drawable.draw(canvas); 

       Rect tRect = new Rect(0, dims.getScoreHeight() 
         + dims.getBoardheight(), dims.getTotalWidth(), 
         dims.getTotalHeight()); 
       canvas.drawRect(tRect, fillTrayPaint); 

       int topHeight = dims.getScoreHeight() + dims.getBoardheight(); 
       int bottom = (dims.getTotalHeight() + 5) 
         - (dims.getTotalWidth()/Tray.TRAY_SIZE); 
       Rect rect = new Rect(0, topHeight, dims.getTotalWidth(), bottom - 7); 
       Drawable drawableTray = getResources() 
         .getDrawable(R.drawable.strip); 
       drawableTray.setBounds(rect); 
       drawableTray.draw(canvas); 
         drawTray(canvas); 
       drawBoard(canvas); 

       // drawScore(canvas); 
       drawMovingTile(canvas); 
      } 


public BoardView(Context context, AttributeSet attrs) { 
     super(context, attrs); 

     SurfaceHolder holder = getHolder(); 
     holder.addCallback(this); 

     // endTurn=(ImageButton)findViewById(R.id.endturn_button_horizontal); 
     thread = new DrawingThread(holder, handler); 
    } 
@Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
      int height) { 
    } 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     final float scale1 = getResources().getDisplayMetrics().density; 
     defaultFontSize = (int) (MIN_FONT_DIPS * scale1 + 0.5f); 
     thread.setDefaultFontSize(defaultFontSize); 
     dimensions = calculateDimensions(getWidth(), getHeight()); 
     thread.setDimensions(dimensions); 

     thread.setRunning(true); 

     // if (thread != null && !thread.isAlive()) 
     thread.start(); 
    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
     boolean retry = true; 
     thread.setRunning(false); 
     while (retry) { 
      try { 
       thread.join(); 
       retry = false; 
      } catch (InterruptedException e) { 

      } 
     } 
    }

The screen is fully draw in canvas which is mention as below :-